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Ë 2 Class S amplifier
- Ground-referenced headphone output - eliminates output coupling capacitors
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I 2 C-amount and mode control
- Mono headphone amplifier
- Flexible outputs are speaker and headphone outputs
- 20 solder ball micro SMD package
- Soft-enable functionality
- "Click" sound suppression circuit
- Thermal shutdown protection
- Low supply current
- Micropower shutdown
illustrate
LM49150 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The Power Wise ® product family in select countries offers excellent audio performance in a variety of operating modes LM49150 very low power consumption. LM49150 combined with a 1.25W single E 2 S (Enhanced Emission Suppression) Class D amplifier, 135MW Class AB headphone amplifier, 42mW/channel stereo ground-referenced headphone amplifier, volume control, and hybrid circuitry into a single device.
Filterless Class D amplifier to My E 2 The Class D amplifier uses a patented ultra-low EMI PWM architecture that significantly reduces RF emissions while maintaining audio quality. The 42mW/channel headphone driver uses National Semiconductor's ground-referenced architecture to create a single-supply ground-referenced output, eliminating bulky, expensive DC-blocking capacitors, saving space and cost.
LM49150 has a fully differential mono input and two single-ended stereo inputs. These three inputs/multiplexes can be mixed, either for speakers or headphone amplifiers. Each input channel has an independent, 32-step digital volume control. The headphone output stage has an additional 8-step gain control, while the speaker output stage has a selectable 6dB or 12dB gain. Mixer, volume control and device mode selection control, via I 2 C-compatible serial interface.
LM49150's superior click and ejection suppression eliminates power-up/down and audible transient noise when closed. The LM49150 is available in an ultra-small 20-ball micro SMD package (2.225mm x 2.644mm).
Main specifications
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■ In VDD= 5V output power:
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Speaker: RL = 8Ω of BTL THD + N ≤ 1％
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1.25W (typical)
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Earphone: RL = THD + N OF 32ΩSE ≤ 1％
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42mW (typical)
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Receiver: RTH + N = 8ΩSE ≤ 1％
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135MW (typical)
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■ In VDD= 3.3V Output Power:
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Speaker: RL = 8Ω of BTL THD + N ≤ 1％
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520mW (typical)
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Earphone: RL = 32Ω of BTL THD + N ≤ 1％
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42mW (typical)
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Receiver: RTH + N = 8ΩSE ≤ 1％
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35MW (typical)
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■ Output offset
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LS mode
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9mV (typical)
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HP mode
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1mV (typical)
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receiver
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1mV (typical)
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■ Single-supply operation (VDD）
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2.7 to 5.5V
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■ I 2 C Single supply operation
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1.7 to 5.5V
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apply
- mobile phone
- Pocket PC
- Portable electronics
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